Public Release: 7-Oct-2010
Crop failures set to increase under climate change

Large-scale crop failures like the one that caused the recent Russian wheat crisis are likely to become more common under climate change due to an increased frequency of extreme weather events, a new study shows.

However, the worst effects of these events on agriculture could be mitigated by improved farming and the development of new crops, according to the research by the University of Leeds, the Met Office Hadley Centre and University of Exeter.

The unpredictability of the weather is one of the biggest challenges faced by farmers struggling to adapt to a changing climate. Some areas of the world are becoming hotter and drier, and more intense monsoon rains carry a risk of flooding and crop damage.

A summer of drought and wildfires has dramatically hit harvests across Russia this year, leading the government to place a ban on wheat exports. This led to a dramatic rise prices on the international commodity markets which is likely to have a knock-on effect in higher prices of consumer goods.

But the authors of the new study, which appears in Environmental Research Letters, argue that adaptation to climate change be possible through a combination of new crops that are more tolerant to heat and water stress, and socio-economic measures such as greater investment.

Lead author Dr Andy Challinor, from the University of Leeds School of Earth and Environment, said: "Due to the importance of international trade crop failure is an issue that affects everyone on the planet, not just those in crop-growing regions.

"More extreme weather events are expected to occur in the coming years due to climate change and we have shown that these events are likely to lead to more crop failures. What we need to do now is think about the solutions.

"It is highly unlikely that we will find a single intervention that is a 'silver bullet' for protecting crops from failure. What we need is an approach that combines building up crop tolerance to heath and water stress with socio-economic interventions."

The team studied spring wheat crops in North East China. They used a climate model to make weather projections up to the year 2099 and then looked at the effect on crop yields. In parallel they looked at socioeconomic factors to determine how well farmers were able to adapt to drought.

While the study only looked at crops in China, the authors say this methodology can be applied to many of the other major crop-growing regions around the globe.

Study co-author Dr Evan Fraser, also of the University of Leeds, said: "It appears that more developed countries with a higher GDP tend to evolve more advanced coping mechanisms for extreme events. In China this is happening organically as the economy is growing quickly, but poorer regions such as Africa are likely to require more in the way of aid for such development.

"What is becoming clear is that we need to adopt a holistic approach: new crops for a changing climate and better farming practices that can only come about under more favourable socio-economic conditions."

The team will now expand their research to look at other crops in different regions and they will look more closely at the reasons why increased GDP appears to protect against drought.

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The research was funded by the Natural Environmental Research Council EQUIP programme and the Economic and Social Research Council Centre for Climate Change Economics and Policy.

For more information

A copy of the paper, 'Increased crop failure due to climate change: assessing adaptation options using models and socio-economic data for wheat in China,' is available to download here. http://iopscience.iop.org/1748-9326/5/3/034012

Dr Andy Challinor is available for interview. Please contact Hannah Isom in the University of Leeds press office on 0113 343 4031 or email h.isom@leeds.ac.uk.

Notes to editors

The 2008 Research Assessment Exercise showed the University of Leeds to be the UK's eighth biggest research powerhouse. The university is one of the largest higher education institutions in the UK and a member of the Russell Group of research-intensive universities. The university's vision is to secure a place among the world's top 50 by 2015.

The Centre for Climate Change Economics and Policy (http://www.cccep.ac.uk/) was established in 2008 to advance public and private action on climate change through rigorous, innovative research. The Centre is hosted jointly by the University of Leeds and the London School of Economics and Political Science. It is funded by the UK Economic and Social Research Council (http://www.esrc.ac.uk/) and Munich Re (http://www.munichre.com/).

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